Improvement in locks for sliding doors



Patented Feb. 27,1877.

R. W.'SEMPLE.

Locas FonrsLIDING nouns.

UNITED STATES ROBERT w. sEMPLE, OE TORONTO, ONTARIO, CANADA, As'sieNoR 'To GEORGE ALEXANDER sHAw, OE SAME PLAOE.

IMPROVEMENT IN LOCKS SLIDING DOORS.

Specification forming part of Letters Patent No. 187,735. dated February 27,1877 application filed Augustv 24, 1876.

To all whom it may concern:

Be it known that I, ROBERT WILLIAM SEM- PLE, of the city of Toronto, in the Province oi Ontario, Canada, machinist, have invented cerings, and to the letters of reference marked thereon, and forming a part oi' this specification.

The object of my invention is to provide a lock which cannot be unlocked and relocked without the operation being detected; and consists more particularly in the peculiar application of a combination lock acting upon a latch, as hereafter specified.

Figure 1 is a back view of lock. Fig. 2 is a front View oi' lock. Fig. 3 is a plan of the index-knob, and Fig. 4 a side view of the same. Fig. 5 is a sectional View on the line a a.

In the drawing, A represents the door, which can be sliding or otherwise; and B the side of the car, to the inside of which I pivot, upon the stud C, the latch D. The quadrant-plate E is keyed or otherwise fastened to the stud. G, and has a slot, e, cut through it, as shown, within which slot e the latch-pin F works. The stud C passes through the sheathing of the car B, and has a handle, Gr, on its outside end, as shown. By raising this handle G a corresponding motion is imparted to the quadrant-plate E, but the latch D is not acted upon till the pin F comes against the end of the slot e, owing` to which the handle G must be moved a considerable distance before the latch D is raised, necessitating the complete destruction of any seal which may have been placed at the end of the handle Gr, in orderto hold it to the eye H. The latch D has a projection or tail, I, extending behind the stud C. This tail passes through a slot in the bolt Q, which enters a casing, J, containing two or more notched disks ortumblers, K, pivoted upon and Operated by the spindle L, in alike manner to any ordinary combination-lock.

I do not claim anything special in the construction ot' this combinationlock, the only thing absolutely necessary being that there should be such an obstruction within the casing .I that shall prevent the bolt Q from ening, and marked as therein represented. This y knob has a hole 'through its center. to corresponding with the shape of the spindle L, which is made with a iiat side, s0 that the knob M can only be put on in one Way. N is the zero-mark.

Having described the general construction ot the lock, I shall proceed to explain its operation. When the door A is closed, the catch O engages with the latch D, and, it' the disks K are then turned so that the bolt Q cannot enter into-the notches in said disks, the door A is locked. We will suppose that the coinbination is set to 5, 10, and 30. In ordenthen to open the door A, take the knob M and slip it onto the spindle L, which you then turn two or three times from left to righ t, finally stopping when the gure 5, stamped on the knob M, comes opposite to the zero-point N. Then make one complete turn from right to left,

passing 5, till l() is reached, again reversing the operation till 30 comes opposite to the zeropoint N, which operation brings the notches l? in the three disks K opposite to the bolt Q, permitting it to enter the casing J as the tail I descends, and the latch D is raised.

In order to make the protection still more secure a stamped lead seal, R, is attached to the point of the handle Gr after it is passed through the eyebolt H, making it necessary to destroy Vthe seal before the handle G can be thrown back. This arrangement has the further advantage ol' indicating when the llock has been tampered with, although it may not have been opened. y

This seal may be of any of the usual types made of stamped lead, and aftixed directly to the spindle L, or fastened to 'it by a wire on which the lead is closed or melted.

Frein the foregoing description and accompanying drawings it will be noticed that the iron-work constituting the latch is all on the inside of the car, and not accessible except by breaking away the sheathing or opening the door, and also that not onl'vis the combina tion-lock attached to the car, but also the handle G and eye H, which ferm an independent fastening.

What I claim as my 4invention is f 1. The quadrant-plate E, keyed or other- Wise/.fastened to the latch-stud C, and having a slot, e, in combination with the latch-pin F and latch D, as and for the purpose specified.

2. The pivoted latch-handle G., in 'combination with and secured totheeye `H by means of' the seal R, or tseqnivalent.

3. The combination of' the latch D, latchpin F, quadrant-plate E, tail-piece I, lockingbolt Q,'With a permutation-lock, substantially as and for the purpose specified.

Witnesses: R, yW. SEMPLE.

S. K gGLAK,

' of Toronto, Barrister. J. ORIGHTQN,

of Toronto, Student-at-Law. 

